Yes, Amy, I am also working off the Adult Jacket pattern, just plugging in the numbers for a baby sized jacket. I think that is where I got confused with your question. My pattern doesn't say anything about rows.

To see if it will be the right size, measure the section in between the stitch markers. At the point you are in the photo (all done with the decreases), It should measure the same as your base measurement - the sweater width that you measured to start your calculations.